I am just merely reading the wattage number off the Delta's LCD panel.
It tells you the input watts going in for solar charging.
In theory, based on how I connected my panels, and each panel spec Voc, Isc and temperature coefficients, I don't think I'll ever hit max voltages to cause any harm to the Delta's solar input.
Pls tell me if my calculations are correct here...Based on my panel's specs, two panels connected in series is ~40V max give and take. Next, this cluster of 2 panels are connected in parallel. So, the voltage in parallel remains ~ 40 V.
See this example picture of 3 clusters of "2-in-series" all in parallel:
https://diysolarforum.com/threads/solar-panel-strings-parallel-series-explained.61/
When connected in parallel, you're just adding up the amps while voltage remains constant..
Therefore, in my setup, I was thinking that the only issue could be the max current.
On a really good day, I think I should be generating ~8A per each cluster of "2-in-series". So, adding up, it should be ~16A being the total amps in Parallel connection. ~16A going into the Delta, while the Delta's charge controller should be limiting the amps to 10A.
However, next month, I am planning to purchase an external watt meter and check both my clusters individually. Then, run some real measurements as well, of the parallel connection assembly.
Where and how did you get this wattage number?
I think you are fortunate you did not exceed the 65v limit, which is supposed to let the magic smoke out.
If you have 3 in series, voltage is added for all panels. Amps some form of averaging.
Seems odd not to gave more than 300w. Probably bad connection somewhere...mismatched MC4 connectors?